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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>P95 5.2.3 JavaScript内置的构造函数</title>
</head>
<body>
    <script>
        var obj=new Object();
        var str=new String('123');
        console.log(obj.constructor);
        console.log(str.constructor);
        console.log({}.constructor);
    </script>
    
</body>
</html>